1. Munjal M, Sangeeta, Grevai RS, Singh D (1999): Pediatric nasopharyangeal foreign bodies. Indian journal of Otolaryngology and head and neck surgery, special number, FB: 80–2.
2. Ogut F, Bereketoglu M, Bilgen C, Totan S (2001): A metal ring that had been lodged in a child’s nasopharynx for 4 years. Ear Nose Throat J, 80: 520–2.
3. Sharma SC, Bano S (1992): An unusual foreign body in nasopharynx. Indian journal of Otolaryngology and head and neck surgery, 1:42–3.
4. Ransome J (1987): Foreign bodies in the Nose. Scott-Brown Otolaryngology, Kerr AG eds, 5th Ed, Vol-6, London, Butterworths, 276.
5. Majumder PK, Sinha AK, Mookherje PB, Ganguly SN (1999): An unusual foreign body (10NP coin) in nasopharynx. Indian Journal of Otolaryngology and Head and Neck Surgery, 52: 93.